Filling detection sensor and filling detection method

Abstract

This invention provides a filling detection sensor whose shape and size can be easily adjusted according to the formwork. [Solution] The filling detection sensor S100 comprises a head portion 10 inserted into a through hole in the mold and a main body portion 20 to which the head portion 10 is detachably attached. The head portion 10 is provided with a sensor portion 15 for detecting the filling of the object to be detected, and the main body portion 20 is provided with an electrical circuit electrically connected to the sensor portion 15. The head portion 10 protrudes from the main body portion 20 when attached to the main body portion 20, and the length d1 of the head portion 10 in a predetermined reference direction A perpendicular to the direction in which the head portion 10 protrudes is shorter than the length d2 of the main body portion 20 in the reference direction A.

Description

Technical Field

[0001] The present invention relates to a filling detection sensor and a filling detection method.

Background Art

[0002] Conventionally, for example, when constructing a tunnel, a sensor attached to a formwork to detect the filling of concrete is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As formworks, for example, there are wooden formworks and steel formworks, and the shapes (especially thicknesses) of wooden formworks and steel formworks may be different. It is also assumed that the shape and size of the holes formed in the formwork differ depending on the type of formwork. Therefore, there has been a need at the site to adjust the shape and size of the sensor according to the shape and size (such as thickness) of the formwork (more precisely, the holes formed in the formwork), but the conventional sensors have not sufficiently met such needs.

[0005] Therefore, the present invention has been made in view of these points, and an object thereof is to provide a filling detection sensor and a filling detection method that can easily adjust the shape and size according to the formwork.

Means for Solving the Problems

[0006] A filling detection sensor in one embodiment of the present invention comprises a head portion inserted into a through-hole of a mold and a main body portion to which the head portion is detachably attached, wherein the head portion is provided with a sensor portion for detecting the filling of a target object, and the main body portion is provided with an electrical circuit electrically connected to the sensor portion, wherein the head portion protrudes from the main body portion when attached to the main body portion, and the length of the head portion in a reference direction perpendicular to the direction in which the head portion protrudes is shorter than the length of the main body portion in the reference direction.

[0007] Of the head portion, a connecting portion may be provided on the side opposite to the side facing the object to be detected, where the sensor portion is located, to which a pulling member for pulling the head portion out of the through hole is connected.

[0008] The head portion and the main body portion are connected by a screw connection, and the connection portion may be a screw hole into which a screw is screwed in, which is provided to protrude from the main body portion, or a member provided to protrude from the head portion.

[0009] The main body portion may be provided with through holes into which fasteners are inserted for fixing the main body portion to the formwork.

[0010] The head portion and the main body portion may be connected by a magnet.

[0011] With the head portion attached to the main body portion, the sensor portion and the electrical circuit may be electrically connected via the magnet.

[0012] The sensor portion includes a pair of electrodes arranged at intervals from each other, and the pair of electrodes may be provided on the tip surface of the head portion.

[0013] The pair of electrodes may be provided on the same plane as the tip surface, or in a position recessed from the tip surface.

[0014] The contour shape of the main body portion has a reference side extending in a predetermined direction, and the direction in which the pair of electrodes are aligned when the head portion is attached to a predetermined fixed position of the main body portion may be parallel to or perpendicular to the reference side.

[0015] The main body may have a recess into which a part of the head portion is inserted.

[0016] The main body portion has a recess into which a part of the head portion is inserted, and a groove is formed in the portion of the head portion that is inserted into the recess. The main body portion may also be provided with a projection that fits into the groove when the head portion is attached to the main body portion.

[0017] A sealing member may be placed between the head portion and the main body portion to prevent water from entering the electrical connection portion that electrically connects the sensor portion and the electrical circuit.

[0018] The sealing member is a ring-shaped elastic member and may be provided at least one of the following positions: between the side of the head portion opposite to the side on which the sensor portion is provided and the side of the main body portion facing that side; and between the outer circumferential surface of the portion of the head portion that is inserted into the recess formed in the main body portion and the inner circumferential surface of the recess.

[0019] The device includes a connecting structure that connects the head portion and the main body portion, the connecting structure may include a connecting terminal provided to protrude from one of the head portion and the main body portion, and a terminal receiver provided on the other of the head portion and the main body portion into which the connecting terminal is inserted in a predetermined insertion direction.

[0020] The connection structure may further include a retaining mechanism to prevent the connection terminal from coming out of the terminal receiver when the head portion is rotated around a rotation axis parallel to the insertion direction, from a first state in which the connection terminal is inserted into the terminal receiver to a second state in which the head portion is rotated around a rotation axis parallel to the insertion direction.

[0021] The contour shape of the main body portion has a reference side extending in a predetermined direction, the head portion has a pair of electrodes arranged at intervals from each other, and the direction in which the pair of electrodes are arranged intersects the reference side in the first state and may be configured to be parallel or orthogonal to the reference side in the second state.

[0022] At least one of an indicator indicating the direction of rotation of the head portion with respect to the main body portion or an indicator indicating the orientation of the main body portion may be provided on the main body portion or the head portion.

[0023] The main body portion has a recess into which the head portion is inserted, the head portion has a proximal end side portion inserted into the recess and a distal end side portion formed to project from the proximal end side portion, and the contour of the distal end side portion may be provided in a shape located inside the contour of the proximal end side portion when the head portion is viewed from the distal end side.

[0024] A seal member is provided between the head portion and the main body portion, and the seal member may be provided at least at one of a position between the outer peripheral surface of the proximal end side portion and the inner peripheral surface of the recess and a position between the surface of the head portion on the side opposite to the side where the sensor portion is provided and the surface of the main body portion facing the surface.

[0025] A connection structure for connecting the head portion and the main body portion is provided, the connection structure has a conductive first connection member provided on the main body portion and a conductive second connection member provided on the head portion, and by bringing the head portion close to the main body portion and rotating it around a predetermined rotation center axis to a fixed position, a part of the first connection member and a part of the second connection member engage with each other, and the first connection member and the second connection member may be electrically connected.

[0026] The second connection member has a contact plate portion extending in a direction intersecting the rotation center axis, and a connection portion extending from the contact plate portion toward the side of an electrode provided at the tip of the head portion. When the head portion rotates to the fixed position, the surface of the contact plate portion may contact a part of the surface of the first connection member.

[0027] The contact plate portion may have an inclined guide surface that guides the part of the first connection member to ride on the contact plate portion when the head portion is rotating around the rotation center axis.

[0028] A fixing screw or a fixing pin is inserted into the contact plate portion. When the head portion rotates to the fixed position, the fixing screw or the fixing pin may contact the first connection member so that the head portion does not rotate further.

[0029] As the second connection member, one second connection member and the other second connection member are provided on the head portion. A resistance element may be provided so as to be spanned between the fixing screw or the fixing pin provided on one second connection member and the fixing screw or the fixing pin provided on the other second connection member.

[0030] [[ID=1�]] A filling detection method according to one embodiment of the present invention includes a step of attaching the filling detection sensor described above to a mold, and a step of detecting that a detection object has been filled based on a detection result of the filling detection sensor.

[0031] A filling detection method according to one embodiment of the present invention may further include a step of attaching the filling detection sensor to the mold in such a direction that a first electrode and a second electrode of the pair of electrodes provided on the tip surface of the head portion are arranged side by side in a direction intersecting in the vertical direction.

Advantages of the Invention

[0032] The present invention provides a filling detection sensor and a filling detection method that can be easily adjusted in shape and size according to the mold. [Brief explanation of the drawing]

[0033] [Figure 1] This is a perspective view showing the configuration of the detection sensor of the first embodiment. [Figure 2] This is a front view of detection sensor 1. [Figure 3] Figure 1 is a side view of the detection sensor. [Figure 4] This is a schematic cross-sectional view showing the cross-section along line XX in Figure 2. [Figure 5] This is a front view of the main body. [Figure 6] This diagram schematically shows a state in which a filling detection sensor is attached to an arch-shaped formwork, and a front view of the filling detection sensor in that state. [Figure 7] This figure shows the filling detection sensor attached to the mold. [Figure 8] This figure shows the filling detection sensor being removed from the mold. [Figure 9] This is an exploded perspective view showing the filling detection sensor of the second embodiment. [Figure 10] This figure shows the filling detection sensor in Figure 9 attached to the mold. [Figure 11] This is a perspective view showing a modified example of the second embodiment. [Figure 12] This diagram shows the configuration of the filling detection sensor according to the third embodiment. [Figure 13] This is a schematic diagram showing the configuration of the filling detection sensor of the fourth embodiment. [Figure 14] This figure shows the head portion of the filling detection sensor according to the fourth embodiment. [Figure 15] This figure shows the main body of the filling detection sensor according to the fourth embodiment. [Figure 16] This diagram illustrates the process of attaching the head unit to the main unit. [Figure 17]This is a diagram illustrating the structure of the retaining mechanism. [Figure 18] This figure shows an example configuration of a filling detection sensor equipped with a sealing member. [Figure 19] This figure shows another example of a filling detection sensor equipped with a sealing member. [Figure 20] This figure shows an example where the placement position of the sealing component has been changed. [Figure 21] This figure shows an example in which a predetermined indicator is provided on the head and main body of the filling detection sensor. [Figure 22] This figure shows a modified example of a filling detection sensor. [Figure 23] This is a diagram illustrating the stepped head section. [Figure 24] This diagram shows the head portion remaining in the formwork. [Figure 25] This figure shows an example of a filling detection sensor in Figure 23 that is provided with a sealing member. [Figure 26] This figure shows another example of the arrangement of sealing members. [Figure 27] This is a perspective view showing an example of the connection structure between the head unit and the main unit. [Figure 28] Figure 27 is a partially exploded perspective view. [Figure 29] This is an exploded perspective view showing a portion of the head section cut away. [Figure 30] This is a diagram showing the second connecting member. [Figure 31] This is a schematic diagram showing the state before the first connecting member and the second connecting member are connected. [Figure 32] This is a perspective view showing the state in which the first connecting member and the second connecting member are connected. [Figure 33] This diagram illustrates the connection operation based on the connection structure. [Figure 34] This diagram schematically shows the head unit connected to the main unit. [Figure 35] This is a schematic diagram illustrating an example configuration for the arrangement of resistive elements. [Figure 36]This diagram shows the resistive element fixed to the second connecting member. [Modes for carrying out the invention]

[0034] (First Embodiment) Figure 1 is a perspective view showing the configuration of the filling detection sensor of the first embodiment. Figure 2 is a front view of the filling detection sensor of Figure 1. Figure 3 is a side view of the filling detection sensor of Figure 1. Figure 4 is a schematic cross-sectional view showing the cross section along line XX in Figure 2. Figure 5 is a front view of the main body.

[0035] The filling detection sensor S100 of this embodiment is a sensor for detecting the filling of a target object. The target object may be something other than concrete, but concrete is used as an example in this embodiment. The filling detection sensor S100 is used, for example, when concrete is poured in a tunnel, and is attached to the formwork. The filling detection sensor S100 comprises a head portion 10 and a main body portion 20.

[0036] (Head section 10) As shown in Figure 1, the head portion 10 is attached to the main body portion 20 so as to protrude from the main body portion 20. The head portion 10 is detachably attached to the main body portion 20. In this example, the head portion 10 is cylindrical and extends along the central axis CL. The head portion 10 has a front surface 11, an outer peripheral surface 12, and a back surface 13 (see Figure 4).

[0037] The contour shape of the head portion 10 (the contour shape when the filling detection sensor S100 is viewed from the front, as shown in Figure 2) is not limited to a circle, but may be any shape such as a square, polygon, or ellipse. In this embodiment, for example, a cylindrical head portion of a first size and a cylindrical head portion of a second size (specifically, a cylindrical head portion with a larger diameter than the first size) may be interchangeably attached to the main body portion 20. Alternatively, for example, a cylindrical head portion and a polygonal prism-shaped head portion may be interchangeably attached to the main body portion 20.

[0038] The head portion 10 is provided with a sensor portion 15 (see Figures 2 and 4). The sensor portion 15 is for detecting the filling of concrete and, in this example, is composed of a pair of electrodes. The pair of electrodes consists of a first electrode 15a and a second electrode 15b. The first electrode 15a and the second electrode 15b are provided on the tip surface 11 at a distance from each other. The first electrode 15a and the second electrode 15b have a symmetrical shape.

[0039] When the first electrode 15a and the second electrode 15b are in contact with concrete, a current flows between the first electrode 15a and the second electrode 15b. When the first electrode 15a and the second electrode 15b are not in contact with concrete, no current flows between them. Thus, the resistance value between the first electrode 15a and the second electrode 15b changes depending on whether or not concrete is filled in. Head lead wires 16 (first head lead wire 16a and second head lead wire 16b) are connected to the first electrode 15a and the second electrode 15b, as shown in Figure 4. The head lead wires 16 are used, for example, to apply a voltage between the first electrode 15a and the second electrode 15b from an external device via the main body 20, and to measure the resistance value between the first electrode 15a and the second electrode 15b based on the voltage between them. The head lead wires 16 are connected to the first terminal 29a.

[0040] As an example, the first electrode 15a and the second electrode 15b are provided such that their surfaces are flush with the tip surface 11 of the head portion 10. As will be described later, the tip surface 11 is the surface that comes into contact with concrete, and when the first electrode 15a and the second electrode 15b are configured in this way, there is an advantage that the electrode marks are less likely to be left on the concrete.

[0041] The first electrode 15a and the second electrode 15b do not necessarily need to be on the same plane as the tip surface 11; they may be positioned recessed from the tip surface 11. The head portion 10 is expected to be fixed to the through-hole of the formwork after the concrete has hardened, as will be described later. In order to remove the head portion 10 from the formwork, the head portion 10 may be struck with a hammer (including striking it with a piece of wood as a buffer), but the configuration in which the first electrode 15a and the second electrode 15b do not protrude beyond the tip surface 11 has the advantage that the first electrode 15a and the second electrode 15b are less likely to be damaged during such work.

[0042] (Main body 20) The main body 20 is the component to which the head 10 is attached. The main body 20 is provided with an electrical circuit that is electrically connected to the sensor 15. The electrical circuit includes a second terminal 29b that contacts the first terminal 29a. The electrical circuit may also include a resistor (for example, 2kΩ) connected between the first electrode 15a and the second electrode 15b. As an example, in this embodiment, the main body 20 houses a circuit board 28 inside which an electrical circuit electrically connected to the sensor 15 via the second terminal 29b is provided.

[0043] Regarding the physical connection between the head portion 10 and the main body portion 20, in this embodiment, as shown in Figure 4, the head portion 10 and the main body portion 20 are connected by a screw connection. A screw 25 is provided on the front surface 21 of the main body portion 20 so as to protrude from the main body portion 20.

[0044] On the other hand, the head portion 10 has a screw hole 17 into which a screw 25 is screwed. Specifically, the screw hole 17 is formed in the center of the back surface 13 on the side opposite to the side that faces the concrete during use. This screw hole 17 also functions as a connection point to which a pull-out member is connected for pulling the head portion 10 out of the through hole in the formwork. This will be described later with reference to other drawings.

[0045] In one embodiment of the present invention, instead of a screw hole 17, a member provided to protrude from the head portion 10 may function as a connecting part to which the extraction member is connected. For example, a member such as a screw or bolt may protrude from the head portion 10, and by connecting the extraction member to this member and pulling, the head portion 10 may be pulled out from the through hole of the formwork.

[0046] In this embodiment, an example of screw connection is shown, but various structures other than screw connection can be used to connect the head portion 10 and the body portion 20. For example, the head portion 10 and the body portion 20 may be connected by a claw formed on one of the head portion 10 and the body portion 20 catching on a recess formed on the other. In this case, it is preferable that the claw and recess are provided so that the connection can be released and the head portion 10 can be removed by, for example, a worker pressing on a part of the claw.

[0047] Regarding the electrical connection between the head unit 10 and the main unit 20, in this embodiment, as shown in Figure 4, with the head unit 10 attached to the main unit 20, the sensor unit 15 is electrically connected to the electrical circuit of the substrate 28. For example, the first terminal 29a provided on the head unit 10 and the second terminal 29b provided on the main unit 20 are in contact with each other, thereby electrically connecting the first electrode 15a and the second electrode 15b of the sensor unit 15 to the substrate 28 via the head lead wires 16 (first head lead wire 16a and second head lead wire 16b) and the main unit lead wires 30 (first main unit lead wire 30a and second main unit lead wire 30b).

[0048] The substrate 28 is provided with an electrical circuit for outputting the voltages of the first electrode 15a and the second electrode 15b to an external device. The electrical circuit includes a circuit for connecting the main lead wire 30 and the external lead wire 31. The electrical circuit may also include a circuit for amplifying the voltage between the first electrode 15a and the second electrode 15b and outputting the amplified voltage to the external device via the external lead wire 31.

[0049] The electrical circuit may include a circuit for detecting the resistance value between the first electrode 15a and the second electrode 15b based on the voltages of the first electrode 15a and the second electrode 15b, and a circuit for outputting the resistance value to an external device via an external lead wire 31. By detecting the resistance value in the main body 20, the resistance value between the first electrode 15a and the second electrode 15b is detected regardless of the length of the external lead wire 31, thereby improving the accuracy of determining whether or not concrete has been filled.

[0050] In addition, the filling detection sensor S100 may be equipped with a sensor of a different type than the resistive sensor that detects whether or not concrete is filled based on the resistance value between the first electrode 15a and the second electrode 15b. For example, one or more of a pressure sensor, a temperature sensor, and an acceleration sensor may be provided. These sensors may be provided on the head portion or the main body portion. In particular, such sensors may be provided on the side of the main body portion opposite to the head portion. The filling detection sensor S100 may also have a built-in battery. In this embodiment, the configuration of a resistive sensor having a first electrode 15a and a second electrode 15b is shown, but the detection method is not limited to the resistive type, and various methods such as pressure type, optical type, and capacitive type can be used.

[0051] A pressure sensor is provided, for example, on the tip surface 11 of the head portion 10 and is used to detect the filling pressure of the concrete, which is the object to be detected. A temperature sensor is used, for example, to measure the temperature of the concrete, which makes it possible to determine the hardening status of the concrete. An acceleration sensor detects vibrations applied to the concrete by a vibrator, for example. The presence of an acceleration sensor makes it possible to calculate the amount of compaction energy applied to the concrete, and as a result, the compaction status of the concrete can be understood.

[0052] In the above explanation, a resistor (for example, 2kΩ) connected between the first electrode 15a and the second electrode 15b is provided in the main body 20. The resistor connected between the first electrode 15a and the second electrode 15b may also be provided in the head 10. The resistor is not limited to a specific resistance value, and an appropriate resistance value should be selected according to the specifications of the filling detection sensor S100, etc.

[0053] (External dimensions of the main body 20) The outline shape of the main body 20 (the shape of the outline when the main body 20 is viewed from the front, as shown in Figure 2) is not limited to a specific shape, but in this example it is rectangular. The main body 20 is provided with a plurality of through holes 23. The through holes 23 are holes into which fasteners (fixing screws) are inserted when attaching the filling detection sensor S100 to the mold. The through holes 23 extend in the thickness direction of the main body 20, and this direction is specifically parallel to the extension direction of the central axis CL.

[0054] As shown in Figure 2, the main body 20 is formed to be larger than the head 10. Specifically, as shown in Figure 3, the main body 20 has a shape such that the length d1 of the head 10 in the reference direction A, which is perpendicular to the direction in which the head 10 protrudes, is shorter than the length d2 of the main body 20.

[0055] As will be described later, the head portion 10 is inserted into the through-hole of the formwork. Because the main body portion 20 is formed to be larger than the head portion 10, the head portion 10 protruding from the main body portion 20 can be easily inserted into the through-hole of the formwork.

[0056] (Relationship between the orientation of the main body 20 and the orientation of the sensor unit 15) The first electrode 15a and the second electrode 15b are positioned so as to be aligned in the left-right direction in Figure 2. Specifically, in this embodiment, with the head portion 10 attached to the main body portion 20 in a predetermined fixed position, the direction in which the first electrode 15a and the second electrode 15b are aligned (the direction connecting the XX lines in Figure 2) is parallel to the upper edge 20p and the lower edge 20q of the main body portion 20, and perpendicular to the left edge 20l and the right edge 20r of the main body portion 20.

[0057] In one embodiment, the filling detection sensor S100 is preferably mounted on the formwork in a direction such that the direction in which the first electrode 15a and the second electrode 15b are aligned intersects the vertical direction (preferably the horizontal direction) when concrete is poured. When the direction in which the first electrode 15a and the second electrode 15b are aligned is vertical, the filling of concrete cannot be detected until the concrete is filled to a height where it contacts both the first electrode 15a and the second electrode 15b. However, when the direction in which the first electrode 15a and the second electrode 15b are aligned intersects the vertical direction (preferably the horizontal direction), the filling of concrete can be detected at an earlier timing. The direction in which the first electrode 15a and the second electrode 15b are aligned is preferably horizontal, but may be substantially horizontal within a range of ±10° from the horizontal direction, for example.

[0058] Here, the statement that "the directions in which the first electrode 15a and the second electrode 15b are aligned intersect in the vertical direction" does not exclude the possibility that the filling detection sensor S100 may be mounted on a formwork other than the vertical one. Figure 6 schematically shows the state in which the filling detection sensor is mounted on an arch-shaped formwork, and a front view of the filling detection sensor in that state. Figure 6(a) shows a cross-section of the formwork and the filling detection sensor mounted on the formwork, and Figure 6(b) shows the filling detection sensor viewed from the direction of the white arrow (horizontal direction) in Figure 6(a).

[0059] In Figure 6(a), the filling detection sensor S100 is attached to the arch-shaped formwork 60. Although the filling detection sensor S100 itself is inclined with respect to the vertical direction as shown in Figure 6(a), as shown in Figure 6(b), the direction in which the first electrode 15a and the second electrode 15b are aligned is horizontal, perpendicular to the vertical direction (up and down direction in the figure). By arranging the filling detection sensor S100 in this orientation, the aforementioned effect is achieved, which is that concrete filling can be detected at an earlier timing.

[0060] In order to attach the filling detection sensor S100 to the mold in this orientation, it is desirable that the operator be able to check the orientation of the head unit 10 by looking at the orientation of the main unit 20. In this embodiment, as described above, the direction in which the first electrode 15a and the second electrode 15b are aligned is parallel or perpendicular to the reference side (in this example, the upper side 20p, the lower side 20q, the left side 20l, and the right side 20r) that extends in a predetermined direction from the contour shape of the head unit 10, so that the operator can easily check the orientation of the head unit 10 and attach the filling detection sensor S100 to the mold in the appropriate orientation. The reference side is, for example, a straight side.

[0061] In this embodiment, all four sides of the contour of the main body 20 correspond to the reference sides. However, the contour shape of the main body 20 may be a so-called D-shape, for example, a circle with a part cut off by a straight line. In such a case, it is sufficient that the direction in which the first electrode 15a and the second electrode 15b are aligned is parallel or perpendicular to one of the reference sides. Even with such a configuration, when the head 10 is attached to the main body 20, the direction in which the first electrode 15a and the second electrode 15b are aligned is in a predetermined direction with respect to the reference side, making it easier for the operator to confirm the orientation when attaching the filling detection sensor S100.

[0062] (Installation and removal of the filling detection sensor S100 from the mold 60) Figure 7 shows the filling detection sensor attached to the formwork. Figure 8 shows the filling detection sensor removed from the formwork. As shown in Figure 7, the formwork 60 is a plate-shaped member with through holes 61 formed therein. Although only one through hole 61 is depicted in Figure 7, the formwork 60 has multiple through holes 61 formed therein. The through holes 61 may be circular or square, but in this embodiment they are circular. In this example, the formwork 60 is flat. The formwork 60 may also be a curved plate, such as a cellulose formwork.

[0063] As shown in Figure 7, the filling detection sensor S100 is attached to the side of the formwork 60 opposite to the side where concrete is filled. Specifically, the filling detection sensor S100 is fixed to the formwork 60 by inserting a fixing screw Sw, which is passed through a through hole 23 in the main body 20, into the formwork 60. In this state, the head portion 10 is inserted into the through hole 61, and the sensor portion 15 is exposed on the side where concrete is filled.

[0064] The filling detection sensor S100 detects when concrete has been filled to the height of the sensor unit 15 and the concrete has come into contact with the first electrode 15a and the second electrode 15b by utilizing the change in the resistance value between the two electrodes.

[0065] After the concrete has hardened, the formwork 60 is removed from the concrete, for example, as shown in Figure 8(a). Subsequently, the filling detection sensor S100 is removed from the formwork 60.

[0066] When concrete is poured, unhardened concrete may get between the outer circumference of the head portion 10 and the inner circumference of the through hole 61, and harden there, causing the head portion 10 to become fixed inside the through hole 61. In this case, the filling detection sensor S100 may be removed from the formwork 60 by pulling it strongly, but the head portion 10 may also be removed as follows.

[0067] Specifically, as shown in Figure 8(b), first, the main body 20 is removed from the head 10, and a bolt B is connected to the screw hole 17 of the head 10. This bolt B is an extraction member for pulling the head 10 out of the through hole 61. Then, by pulling this bolt B with a tool or a predetermined jig, the head 10 is pulled out of the through hole 61. In this way, according to the configuration of this embodiment, the head 10 can be easily removed using the screw hole 17 and the bolt B.

[0068] The head unit 10, which has been removed from the formwork 60, is reconnected to the main body unit 20 and reused as a filling detection sensor S100.

[0069] (Effects of the S100 filling detection sensor) As described above, in the filling detection sensor S100 of this embodiment, the head portion 10 is detachable from the main body portion 20, and head portions 10 of various shapes and sizes can be connected to the main body portion 20, making it possible to easily adjust the shape and size according to the mold. For example, if the mold has a relatively large through hole 61, the operator can use a head portion 10 with a large diameter, and if the through hole 61 is relatively small, they can use a head portion 10 with a small diameter.

[0070] Furthermore, if the head unit 10 is damaged, instead of replacing the entire filling detection sensor S100 with a new one, the main unit 20 can be left as is, and only the head unit 10 can be replaced with a new one, allowing for continued use and thus reducing installation costs.

[0071] According to the configuration of this embodiment, the screw hole 17 for connecting the head portion 10 and the main body portion 20 can be used as a connection part to which a pull-out member for pulling the head portion 10 out of the through hole 61 of the formwork 60 is connected. Therefore, there is no need to provide a separate connection part for connecting the pull-out member in addition to the connection part for connecting the head portion 10 and the main body portion 20, and the structure can be simplified.

[0072] According to the configuration of this embodiment, the filling detection sensor S100 can be easily attached to the mold 60 by a fixing screw Sw passed through the through hole 23 of the main body 20.

[0073] As described above, according to the filling detection method which includes the steps of attaching the filling detection sensor S100 to the formwork 60 and detecting that concrete has been filled based on the detection result of the filling detection sensor S100, various shapes and sizes of head parts 10 can be connected to the main body part 20, as previously stated, so the shape and size can be easily adjusted according to the formwork.

[0074] (Second Embodiment) Figure 9 is an exploded perspective view showing the filling detection sensor of the second embodiment. Figure 10 shows the filling detection sensor of Figure 9 attached to the mold. The filling detection sensor S101 of Figure 9 comprises a head portion 10A and a main body portion 20A, similar to the configuration of the first embodiment. The basic configuration of the filling detection sensor S101 is the same as that of the filling detection sensor S100 of the first embodiment, so redundant explanations are omitted.

[0075] The main body portion 20A has a recess 21a into which the base end of the head portion 10A is inserted. The recess 21a is formed on the front surface 21 of the main body portion 20A. In this example, the inside of the recess 21a is formed in a cylindrical shape.

[0076] The head portion 10A is fixed to the main body portion 20A while inserted into the recess 21a. While fixed to the main body portion 20A, the head portion 10A protrudes from the main body portion 20A, similar to the first embodiment.

[0077] The filling detection sensor S101 is attached to the formwork 60 as shown in Figure 10(a). When removing the filling detection sensor S101 after the concrete has hardened, for example, the main body 20A is first removed from the head 10A. In the filling detection sensor S101, a part of the head 10A is inserted into the recess 21a of the main body 20A, so when the head 10A is removed, a part of the head 10A protrudes from the formwork 60 as shown in Figure 10(b).

[0078] With this configuration, the head portion 10A that protrudes from the formwork 60 can be easily removed from the through hole 61 by, for example, tapping it with a tool or gripping and pulling it with a jig.

[0079] (Modified version of the second embodiment) Figure 11 is a perspective view showing a modified example of the second embodiment. In the filling detection sensor S101, the head portion 10A and the main body portion 20A may be configured as follows so that the head portion 10A is attached to the main body portion 20B in a predetermined orientation.

[0080] In the configuration shown in Figure 11, a groove 18 is formed in the portion of the head portion 10A that fits into the recess 21a of the main body portion 20A. For example, the groove 18 is formed so as to be carved radially inward from the peripheral wall surface of the head portion 10A.

[0081] On the other hand, a projection 26 is formed in the recess 21a of the main body 20A. The projection 26 fits into the groove 18 when the head 10A is attached to the main body 20A.

[0082] Thus, by forming a groove 18 in the head portion 10A and a projection 26 that fits into the groove 18 in the main body portion 20A, it becomes possible to define the orientation of the head portion 10A relative to the main body portion 20A. In the case of a structure in which electrical connections are made via the first terminal 29a and the second terminal 29b, as shown in Figure 4, the filling detection sensor S101 is used in a state in which the first terminal 29a and the second terminal 29b are in reliable contact, according to the configuration in Figure 11, so that the accuracy of detecting the filling state of the concrete is improved.

[0083] Furthermore, as a structural component for defining the orientation of the head portion 10A, a structure may be used in which one of the recesses and protrusions is formed on the back surface of the head portion 10A, the other of the recesses and protrusions is formed at the bottom of the recess 21a, and the orientation of the head portion 10A is defined by the recesses and protrusions fitting together.

[0084] (Third embodiment) Figure 12 shows the configuration of the filling detection sensor according to the third embodiment. In the first embodiment, a configuration in which the head portion 10 is attached to the main body portion 20 by screw coupling was illustrated, but the present invention is not limited to such a configuration. The filling detection sensor S102 in Figure 12 comprises a head portion 10B and a main body portion 20B. The head portion 10B is connected to the main body portion 20B by a magnet.

[0085] The head portion 10B is provided with magnets m1 and m2. On the other hand, the main body portion 20B is provided with magnets M1 and M2. In the filling detection sensor S102 of Figure 12, the head portion 10B is connected to the main body portion 20B by the attraction of magnets m1 and M1 to each other, and by the attraction of magnets m2 and M2 to each other. Thus, in the present invention, the head portion 10B and the main body portion 20B may be connected by magnets.

[0086] The magnets may simply be used to physically connect the head unit 10B and the main unit 20B, but in the configuration shown in Figure 12, the magnets also function as components that electrically connect the sensor unit 15 and the substrate 28. Specifically, each magnet is, for example, plated with a conductive material. With the head unit 10B attached to the main unit 20B, magnet m1 and magnet M1 come into contact, electrically connecting the first electrode 15a to the substrate 28, and magnet m2 and magnet M2 come into contact, electrically connecting the second electrode 15b to the substrate 28.

[0087] With this configuration in which the sensor unit 15 is electrically connected to the substrate 28 via a magnet, there is no need to provide a separate means for electrically connecting the sensor unit 15 and the substrate 28 in addition to the means for physically connecting the head unit 10B and the main unit 20B, thus simplifying the configuration.

[0088] In Figure 12, a configuration is shown as an example in which a pair of magnets m1 and M1, and a pair of magnets m2 and M2 are provided for electrical connection via magnets. However, the present invention is not limited to this configuration, and a configuration in which one magnet is provided in the head portion 10B and the main body portion 20B may also be used. As shown in Figure 9, in a configuration in which a recess 21a is formed in the main body portion 20A, the above-described connection by magnets may also be used.

[0089] (Fourth Embodiment) Figure 13 is a schematic diagram showing the configuration of the filling detection sensor of the fourth embodiment. Figure 14 is a diagram showing the head portion of the filling detection sensor of the fourth embodiment. Figure 14(a) is a front view of the head portion, Figure 14(b) is a right side view of the head portion, and Figure 14(c) is a rear view of the head portion. Figure 15 is a diagram showing the main body portion of the filling detection sensor of the fourth embodiment. Figure 15(a) is a front view of the main body portion, and Figure 15(b) is a diagram illustrating the internal structure of the main body portion. Figure 16 is a diagram illustrating the operation of attaching the head portion to the main body portion. Figure 17 is a diagram illustrating the retaining mechanism. Note that in the following description, the explanation of structural parts common to the embodiments described above will be omitted.

[0090] As shown in Figure 13, the filling detection sensor of this embodiment comprises a head portion 10C, a main body portion 20C, and a connecting structure 50. One of the features of the filling detection sensor of this embodiment is that a connecting structure 50 is provided to connect the head portion 10C and the main body portion 20C.

[0091] The head portion 10C has a tip surface 11, an outer peripheral surface 12, and a back surface 13, similar to the first embodiment (see Figure 14(a)).

[0092] As shown in Figure 13, the connection structure 50 includes a connection terminal 51, a terminal receiver 55, and a retaining mechanism 70.

[0093] As shown in Figure 14, the connection terminal 51 is a component provided on the head portion 10C. The connection terminal 51 consists of a pair of connection terminals 51 that extend parallel to each other. The connection terminals 51 are provided so as to protrude from the back surface 13 of the head portion 10C. Through holes 51h are formed in the connection terminals 51.

[0094] The terminal receptacle 55 is a recess into which the connecting terminal 51 is inserted. Specifically, the terminal receptacle 55 is provided with a pair of recesses corresponding to each connecting terminal 51. As shown in Figure 15(a), the terminal receptacle 55 has an arc-shaped contour in plan view. One terminal receptacle 55 and the other terminal receptacle 55 have a point-symmetric shape with respect to the center P. The connecting terminal 51 is inserted into the terminal receptacle 55 in a predetermined insertion direction (see arrow in Figure 13).

[0095] As shown in Figure 16(a), in this embodiment, the head portion 10C is first connected to the main body portion 20C at a slightly inclined orientation (first state). In this state, the direction in which the pair of electrodes are aligned (line L1) intersects the reference edges (top edge, bottom edge, left edge, right edge) of the contour of the main body portion 20C. Also, in this first state, the connection terminal 51 is inserted into the terminal receiver 55, but the anti-dislodgement function of the anti-dislodgement mechanism 70 (details below) is not being performed. Therefore, in this state, the head portion 10C can be removed from the main body portion 20C by pulling the head portion 10C in the opposite direction to the insertion direction.

[0096] Subsequently, as shown in Figure 16(b), the head portion 10C is rotated. In this example, the head portion 10C is rotated clockwise around a rotation axis passing through the center P. The rotation axis is an axis that extends in a direction parallel to the insertion direction of the head portion 10C. In Figure 16(b), the head portion 10C is in the second state, in which state the line L1 extends in a direction parallel or perpendicular to the reference side of the contour of the main body portion 20C. Thus, when the head portion 10C is in a predetermined fixed position, the orientation of the first electrode 15a and the second electrode 15b relative to the main body portion 20C is parallel or perpendicular to the reference side, which has the advantage, as mentioned above, that it is easy for the worker to attach the filling detection sensor S100 in the appropriate orientation when attaching the filling detection sensor to the mold.

[0097] Furthermore, in this state, the retaining mechanism 70 prevents the connection terminal 51 from coming out of the terminal receiver 55. In other words, the retaining function of the retaining mechanism 70 is activated, and even if the head unit 10C is pulled, the head unit 10C will not detach from the main unit 20C.

[0098] In this specification, "retaining from coming off" does not necessarily mean that the head portion 10C cannot be completely removed from the main body portion 20C, but also includes the condition that the connection terminal 51 is difficult to remove from the terminal receiver 55, and as a result, the head portion 10C is difficult to remove from the main body portion 20C.

[0099] (Retaining mechanism 70) As shown in Figure 17, the retaining mechanism 70 includes a terminal guide plate 71 and a connecting member 75. Although Figure 17 shows only one terminal guide plate 71 and one connecting member 75, the retaining mechanism 70 includes other terminal guide plates 71 and other connecting members 75, which are positioned point-symmetrically with respect to the center P.

[0100] The terminal guide plate 71 is a member formed in a curved shape as a whole, comprising a first portion 71a and a second portion 71b. The white dots drawn at the boundary between the first portion 71a and the second portion 71b are drawn to indicate the boundary, and in reality, the first portion 71a and the second portion 71b are smoothly connected to each other.

[0101] For example, the radius of curvature of the second part 71b is smaller than the radius of curvature of the first part 71a. As a result of this configuration, the distance d4 between the second portion 71b of one terminal guide plate 71 and the second portion (not shown) of the other terminal guide plate is shorter than the distance d3 between the first portion 71a of one terminal guide plate 71 and the first portion (not shown) of the other terminal guide plate.

[0102] The connecting member 75 is a member that is electrically connected to the connecting terminal 51 by contacting the connecting terminal 51. The connecting member 75 is provided on the inside (closer to the center P) of the terminal guide plate 71. The connecting member 75 has a protruding portion 75a that fits into the through hole 51h of the connecting terminal 51 when the connecting terminal 51 moves to a predetermined fixed position.

[0103] In the retaining mechanism 70 configured as described above, as the connecting terminal 51 inserted into the terminal receiver 55 (see Figure 15) rotates clockwise from the position indicated by the dashed line in Figure 17, the connecting terminal 51 is guided by the terminal guide plate 71 (particularly the second part 71b), and the connecting terminal 51 is pushed in the direction indicated by the white arrow in Figure 17.

[0104] As a result, the connection terminal 51 moves toward the connecting member 75. Then, as shown by the solid line in Figure 17, when the connection terminal 51 rotates to a predetermined fixed position, the protruding portion 75a fits into the through hole 51h of the connection terminal 51.

[0105] In this way, because the protruding portion 75a fits into the through hole 51h, the connection terminal 51 is unlikely to come out of the terminal receiver 55 even if the head portion 10C is pulled.

[0106] According to the configuration of the fourth embodiment, since the connection structure 50 described above is provided, the head portion 10C can be attached to and detached from the main body portion 20C with simple operation, and since the retaining mechanism 70 is provided, the head portion 10C will not easily come off the main body portion 20C during use.

[0107] Furthermore, the configuration of the connection structure 50 described above can also be combined with a configuration such as the main body 20A having a recess 21a as illustrated in Figure 9. In this case, the connection terminal 51 and terminal receiver 55 are located away from the mold, which has the advantage that liquid is less likely to enter the electrical connection between the head and the main body. The connection structure 50 does not need to have a locking mechanism. The connection structure 50 may also connect the head and the main body simply by inserting the connection terminal 51 into the terminal receiver 55 without rotating the head.

[0108] In the embodiment described above, a configuration in which a connection terminal 51 is provided on the head portion 10C and a terminal receiver 55 is provided on the main body portion 20C was illustrated. However, the terminal receiver 55 may be provided on the head portion 10C and the connection terminal 51 may be provided on the main body portion 20C.

[0109] (Sealing material) When concrete is filled with the filling detection sensor attached to the formwork, there is a risk that moisture or cement slurry in the concrete may seep into the electrical connection between the head and the main body. In addition to moisture in the concrete, it is also conceivable that rainwater, for example, may seep into the electrical connection. Therefore, in one embodiment of the present invention, a sealing member may be provided between the head and the main body.

[0110] Figure 18 shows an example of the configuration of a filling detection sensor equipped with a sealing member. Figure 18(a) is a side view, and Figure 18(b) is a front view of the main body. The filling detection sensor in Figure 18 comprises a head portion 10, a main body portion 20, and a sealing member S.

[0111] The head portion 10 is, for example, identical to that of the first embodiment. The main body portion 20 is also, for example, identical to that of the first embodiment. The head portion and the main body portion may be modified versions of those of the first embodiment (for example, a head portion with the screw hole 17 omitted, and a main body portion with the screw 25 omitted), or they may be different from those of the first embodiment.

[0112] Between the head unit 10 and the main unit 20, there is an electrical connection part 55 that electrically connects the sensor unit (not shown) of the head unit 10 and the electrical circuit (not shown) of the main unit 20. The electrical connection part 55 can be any type that can electrically connect the sensor unit and the electrical circuit, and is not limited to a specific connection method.

[0113] The sealing member S is a component for ensuring watertightness. Specifically, the sealing member S is a component for preventing water or other substances from entering the electrical connection part 55 from the outside of the filling detection sensor. The sealing member S is, as an example, a ring-shaped elastic member. In this example, the sealing member S is an O-ring with a circular cross-section. The sealing member S may be attached to the head part 10 or to the main body part 20, but in this example, it is attached to the main body part 20.

[0114] The sealing member S is attached to the main body 20, for example, by fitting into a groove formed in the main body 20. As shown in Figure 18(b), the sealing member S has a shape that surrounds the electrical connection part 55. Specifically, the sealing member S has a circular contour shape. With the head part 10 attached to the main body 20, the sealing member S is sandwiched between the head part 10 and the main body 20, thereby ensuring watertightness between the head part 10 and the main body 20.

[0115] With this configuration, which includes the sealing member S, it is prevented from concrete moisture or cement slurry entering the electrical connection part 55, thus reducing the likelihood of the filling detection sensor malfunctioning. The sealing member S also prevents rain from entering, thus preventing the filling detection sensor from malfunctioning due to rain intrusion.

[0116] Although the above example illustrates a sealing member S with a circular cross-section, the cross-sectional shape of the sealing member may be any shape, such as a square, polygon, semicircle, ellipse, or a combination thereof. Although the above example illustrates a sealing member S with a circular contour, the contour shape of the sealing member may also be any shape, such as a square, polygon, semicircle, ellipse, or a combination thereof.

[0117] Figure 19 shows another example of a filling detection sensor with a sealing member. The sealing member S may be provided to seal the space between the head portion 10A and the main body portion 20A in a configuration where a part of the head portion 10A is inserted into the recess 21a of the main body portion 20. Specifically, the sealing member S is located between the side of the head portion 10A opposite to the side on which the sensor portion (not shown) is provided (back surface 13) and the surface 21b of the main body portion 20A facing that surface. Even with this configuration, the filling detection sensor is less likely to malfunction because the sealing member S prevents water from entering the electrical connection portion 55. In particular, in the case of a configuration where a part of the head portion 10A is inserted into the recess 21a of the main body portion 20A, as shown in Figure 10, the back surface of the head portion 10A is located in a position that protrudes more than the mold 60, which has the advantage that water is less likely to enter the electrical connection portion 55 in the first place.

[0118] Figure 20 shows an example where the position of the sealing member has been changed. As shown in Figure 20(a), the sealing member S may be provided on the outer peripheral surface 12 of the head portion 10A. The sealing member S is provided on the outer circumferential surface 12 of the portion of the main body 20A that is inserted into the recess 21a. Specifically, the sealing member S is fitted into an annular groove formed on the outer circumferential surface 12.

[0119] As shown in Figure 20(b), when the head portion 10A is attached to the main body portion 20A, the sealing member S is compressed and tightly adheres to both the outer circumferential surface 12 of the head portion 10A and the inner circumferential surface 21c of the recess 21a. This ensures watertightness between the outer circumferential surface 12 of the head portion 10A and the inner circumferential surface 21c of the recess 21a, preventing water from entering the electrical connection portion 55 from outside the filling detection sensor.

[0120] In Figure 20, a configuration in which a sealing member S is provided on the head portion 10A is illustrated, but the sealing member S may also be provided on the inner circumferential surface 21c of the recess 21a. As shown in Figure 20, a sealing member located on the outer circumferential surface of the head portion and a sealing member located between the back surface of the head portion and the surface of the main body portion 20 opposite it, as shown in Figure 18 or Figure 19, may be used in combination.

[0121] In the examples shown in Figures 18 to 20, the sealing member S is shown to be placed in a groove, but the sealing member S may also be placed between members without forming a groove.

[0122] (indicator) Figure 21 shows an example in which a predetermined indicator is provided on the head and body of a filling detection sensor. In a configuration in which the head is attached to the body by rotating, for example as shown in Figure 16, an indicator 91 indicating the direction of rotation of the head may be provided, as shown in Figure 21(a). The indicator 91 may be provided on either the head or the body, but in this example it is provided on the body. The indicator 91 in Figure 21(a) is, for example, an arrow.

[0123] The configuration shown in Figure 21(b) includes a first indicator 92a provided on the head and a second indicator 92b provided on the main body. By rotating the head to a predetermined fixed position, the first indicator 92a and the second indicator 92b face each other, allowing the operator to confirm that the head is properly attached to the main body.

[0124] As mentioned above, it is preferable to mount the filling detection sensor to the mold so that the orientation of the pair of electrodes is horizontal. To enable the filling detection sensor to be mounted to the mold in this appropriate orientation, the configuration in Figure 21(c) is provided with an indicator 93 that shows the orientation of the main body. For example, the indicator 93 is provided on the back of the main body. In this configuration, by mounting the filling detection sensor S100 with the indicator 93 facing upwards, the pair of sensors are aligned horizontally.

[0125] The indicators may be formed by printing on each component, or by forming them using a mold or the like. The indicators are not limited to arrows or geometric shapes, but may also be letters.

[0126] In the configuration of the fourth embodiment, the operator can rotate the main body to rotate the head and main body relative to each other, thereby separating the head and main body. If the head is fixed inside the through-hole of the formwork after the concrete has hardened, it is conceivable that the main body can be removed by rotating it. Therefore, in such cases, an indicator (e.g., an arrow) showing the direction of rotation may be provided on the back of the main body to make it easier for the operator to confirm the direction of rotation.

[0127] At concrete pouring sites, multiple filling detection sensors connected to each other may be attached to the formwork. In such cases, the multiple filling detection sensors may be assigned predetermined numbers so that workers can use them as a reference for the order in which to install or remove them.

[0128] (modified version) Figure 22 shows a modified example of the filling detection sensor. As shown in Figure 22(a), the main body 20-1 to which the head portion 10-1 is attached may have a circular contour shape. As shown in Figure 22(b), the contour shape of the head portion 10-2 may be rectangular. The main body 20-2 may have a circular contour shape, but in this example it has a rectangular contour shape. As shown in Figure 22(c), the head portion 10-3 may be provided at a position offset from the center of the main body 20-3. Even with such a configuration, the same effects as in the above embodiment can be obtained by making the length d6 of the main body 20-3 longer than the diameter d5 of the head portion 10-3.

[0129] In the above description, an example was given in which the filling detection sensor has an external lead wire 31 and outputs the voltage or resistance value between the first electrode 15a and the second electrode 15b to an external device via the external lead wire 31. However, the filling detection sensor may also transmit the voltage or resistance value between the first electrode 15a and the second electrode 15b to an external device wirelessly. In this case, the substrate 28 is provided with a battery for operating an electrical circuit, and the electrical circuit may include a circuit for wirelessly transmitting the voltage or resistance value between the first electrode 15a and the second electrode 15b to an external device.

[0130] (Fifth embodiment: Head portion formed in a stepped shape) Figure 23 is a diagram illustrating the stepped head section. Figure 23(a) is a schematic cross-sectional view showing the head section before it is attached to the main body. Figure 23(b) is a diagram showing the head section after it has been attached to the main body.

[0131] The filling detection sensor in Figure 23 comprises a head portion 10D and a main body portion 20D. The main body portion 20D has a configuration similar to that of the main body portion 20A in Figure 9, for example. The main body portion 20D has a front surface 21, and a recess 21a is formed on the front surface 21. The recess 21a is a cylindrical recessed portion from the front surface 21.

[0132] The head portion 10D is generally cylindrical in shape. The head portion 10D has a base portion 14a and a tip portion 14b. Specifically, the head portion 10D has a stepped outer circumference formed by having a base portion 14a which is a large diameter portion and a tip portion 14b which is a small diameter portion.

[0133] The base portion 14a is cylindrical with respect to the central axis CL. The diameter of the base portion 14a is slightly shorter than the inner diameter of the recess 21a. In this example, the entire base portion 14a is inserted into the recess 21a. The present invention is not limited to this, and may also be configured in which only a part of the base portion 14a is inserted into the recess 21a (a configuration in which the base portion 14a protrudes from the front surface 21 when the base portion 14a is inserted into the recess 21a).

[0134] The tip portion 14b is formed to protrude from the base portion 14a. The tip portion 14b is cylindrical with respect to the central axis CL. The diameter of the tip portion 14b is shorter than the diameter of the base portion 14a.

[0135] As the base portion 14a and tip portion 14b are provided in this manner, a stepped surface Sd is formed at the boundary between the base portion 14a and the tip portion 14b. The stepped surface Sd is a surface that extends radially from the head portion 10D. For example, when the head portion 10D is attached to the main body portion 20D (see Figure 23(b)), the stepped surface Sd is located on the same plane as the front surface 21. The stepped surface Sd may be located in a range offset from the front surface 21 by, for example, + / - 5 mm or + / - 2 mm.

[0136] In a configuration where the stepped surface Sd is flush with the front surface 21, the rattling of the filling detection sensor when it is attached to the formwork is reduced. This effect can be obtained even when the offset amount of the stepped surface Sd relative to the front surface 21 is relatively small, for example, within 5 mm.

[0137] (Effects of the configuration in Figure 23) Figure 24 shows the state in which the head portion remains in the formwork. In Figure 24, concrete is shown being filled on one side of the formwork 60. However, if concrete is not filled, for example, and the head portion is a cylindrical shape without any steps, it is conceivable that the head portion will fall through the through-hole 61 of the formwork 60 to the side where concrete is filled (left side in the figure).

[0138] In contrast, with a configuration in which the diameter of the base portion 14a is longer than that of the tip portion 14b, it is possible to prevent the head portion 10D from falling through the through hole 61 to the side where concrete is filled (left side in the figure). Furthermore, with such a configuration, compared to a cylindrical head portion with a constant diameter, water and slurry are less likely to flow to the rear side (right side in the figure) of the head portion 10D, thus preventing water and slurry from entering the inside of the filling detection sensor.

[0139] In Figures 23 and 24, an example configuration is shown in which a cylindrical base portion 14a and a cylindrical tip portion 14b are provided. However, the above-mentioned effects are similarly achieved with configurations other than cylindrical ones. Therefore, in one embodiment of the present invention, it is sufficient that the shape is formed such that, when the head portion is viewed from the tip side (specifically, from a direction along the central axis CL), the contour of the tip portion 14b is located inside the contour of the base portion 14a. The base portion 14a and the tip portion 14b do not need to be coaxial. Even with such a configuration, compared to, for example, a cylindrical head portion with a constant diameter, water and slurry are less likely to flow to the rear surface of the head portion, making it possible to prevent water and slurry from entering.

[0140] (Seal structure) Figure 25 shows an example in which a sealing member is provided in the filling detection sensor of Figure 23. The sealing member S is provided between the outer circumferential surface of the base end portion 14a and the inner circumferential surface of the recess 21a. The sealing member S is, for example, an O-ring. By providing the sealing member S in this way, it is prevented from water or slurry entering the interior of the head portion 10D and the main body portion 20D (see arrow).

[0141] Figure 26 shows another example of the arrangement of the sealing member. Figure 26(a) shows the head portion attached to the main body portion, and Figure 26(b) is an enlarged view of a part of Figure 26(a). In this example, the sealing member S is positioned between the corner of the head portion 10D and the bottom of the recess 21a.

[0142] As shown in Figure 26(b), the sealing member S is positioned to be in contact with the outer circumferential surface 14s', the pressure surface 14t, the inner circumferential surface 21a-1, and the bottom surface 21a-2. The outer circumferential surface 14s' is a circumferential surface with a shorter diameter than the outer circumferential surface 14s. The pressure surface 14t is a plane perpendicular to the central axis CL. The sealing member S is positioned such that the center O1 of its cross-section is inside the outer circumferential surface of the head portion (i.e., the center O1 is inside the outer circumferential surface 14s). With this configuration, the sealing member S is sandwiched in the gap between the pressure surface 14t of the head portion 10D and the bottom surface 21a-2 of the recess 21a, making it possible to seal the gap well. In this example, the sealing member S is also positioned to be in contact with the outer circumferential surface 14s' and the inner circumferential surface 21a-1. Therefore, the ingress of water and slurry is more effectively prevented. The pressurized surface 14t corresponds to "the side of the head portion opposite to the side on which the sensor portion is provided" in this invention. The bottom surface 21a-2 corresponds to "the surface of the main body portion facing that surface."

[0143] In the examples shown in Figures 23 to 26, it was assumed that the head portion 10D is cylindrical as a whole, but the present invention is not limited to this. The contour shape of the base portion 14a may be any shape, such as an ellipse or a polygon. The contour shape of the tip portion 14b may also be any shape, such as an ellipse or a polygon. However, since the tip portion 14b is the part that is inserted into the through hole 61 of the formwork 60, it is preferable that it has a circular contour shape. The contour of the base portion 14a may be formed as a polygon, such as a square or a hexagon, to make it easier to hold the base portion 14a with a tool when removing the head portion from the formwork.

[0144] (Sixth embodiment: Connection structure between the head unit and the main unit) Figure 27 is a perspective view showing an example of the connection structure between the head and the main body. Figure 28 is an exploded perspective view of a part of Figure 27. Figure 29 is an exploded perspective view showing a part of the head cut away. Figure 30 is a diagram showing the second connecting member. Figure 31 is a schematic diagram showing the state before the first connecting member and the second connecting member are connected. Figure 32 is a perspective view showing the state after the first connecting member and the second connecting member are connected.

[0145] In the following explanation, the X, Y, and Z axes are shown in the diagrams to illustrate the structure. The X, Y, and Z axes are mutually orthogonal axes. The X and Y axes correspond to the directions in which one side and the other side of the rectangular outline of the main body extend. The Z axis corresponds to the thickness direction of the main body. The Z axis also corresponds to the depth direction of the recess in the main body. The Z axis also corresponds to the mounting direction of the head to the main body.

[0146] The filling detection sensor shown in Figures 27 to 32 comprises a head unit 10E, a main body unit 20E, and a connection structure 80.

[0147] The head unit 10E includes a housing 14, a first electrode 15a, and a second electrode 15b. The housing 14 is cylindrical in shape as a whole. The first electrode 15a and the second electrode 15b are positioned on the front surface 11 of the housing 14.

[0148] The main body 20E is of the type in which a recess 21a is formed, and its basic configuration is the same as that of Figure 9.

[0149] (Connection structure 80) The connection structure 80 connects the head portion 10E and the main body portion 20E. Specifically, the connection structure 80 connects the head portion 10E and the main body portion 20E both physically (mechanically) and electrically. The connection structure 80 includes a first connecting member 81 (see Figure 27) and a second connecting member 85 (see Figure 28). The fact that the connection structure 80 includes a first connecting member 81 and a second connecting member 85 can be better understood by referring to, for example, Figure 32.

[0150] (First connecting member 81) As shown in Figure 27, the first connecting member 81 is provided as a first connecting member 81-1 and a first connecting member 81-2. The first connecting member 81-1 and the first connecting member 81-2 have the same shape. The first connecting member 81-1 and the first connecting member 81-2 are each electrically connected to the electrical circuit of the circuit board. In the following description, the first connecting member 81-1 will be used as an example. Sometimes, the first connecting member 81-1 and the first connecting member 81-2 are not distinguished and are simply referred to as the first connecting member 81.

[0151] The first connecting member 81 is provided on the main body portion 20E. Specifically, the first connecting member 81 is positioned inside the recess 21a. The first connecting member 81 is provided so that a portion of it protrudes beyond the front surface 21 (see Figure 27) of the main body portion 20E. The present invention is not limited to this, and the entire first connecting member 81 may be housed within the recess 21a so that it does not protrude from the front surface 21.

[0152] The first connecting member 81 is a metallic conductive material. The first connecting member 81 is formed, for example, by bending a single metal plate. The first connecting member 81 includes an L-shaped bent portion, as can be seen from Figure 27. Specifically, the first connecting member 81 includes a terminal contact portion 81a and an extended portion 81b.

[0153] The extended portion 81b is a part that extends in the Z direction so as to rise from the bottom surface of the recess 21a. The extended portion 81b extends along the insulating projection 21d formed in the center of the front surface 21.

[0154] The terminal contact portion 81a is the bent portion from the tip of the extended portion 81b. The terminal contact portion 81a is provided to extend in a direction intersecting the central axis CL. Specifically, the terminal contact portion 81a is provided to extend in the XY plane.

[0155] As shown in Figure 27, the terminal contact portion 81a of one first connecting member 81-1 and the terminal contact portion 81a of the other first connecting member 81-2 are provided to extend in opposite directions with respect to the central axis CL.

[0156] (Second connecting member 85) As shown in Figure 28, the second connecting member 85 is provided as a second connecting member 85-1 and a second connecting member 85-2. The second connecting member 85-1 and the second connecting member 85-2 have the same shape. In the following explanation, the second connecting member 85-1 will be used as an example. Sometimes, the second connecting member 85-1 and the second connecting member 85-2 are not distinguished and are simply referred to as the second connecting member 85.

[0157] The second connecting member 85 is provided on the head portion 10E. Specifically, the second connecting member 85 is located inside the housing 14. The second connecting member 85 may be entirely housed within the housing 14, or a portion of it may protrude outside the housing 14.

[0158] The second connecting member 85 is made of a metallic conductive material. The second connecting member 85 is formed, for example, by bending a single metal plate. As shown in Figure 30, the second connecting member 85 includes a base portion 86, a connecting portion 87, and a contact plate portion 88.

[0159] The base portion 86 is flat. The upper surface of the base portion 86 (the upper surface in Figure 30) is fixed to the lower surface of the first electrode 15a (see Figure 29). One example of a fixing method is welding.

[0160] The connecting portion 87 extends from the base portion 86 in a direction (Z direction) away from the base portion 86, bending outwards. As an example, the connecting portion 87 is bent at a right angle to the base portion 86.

[0161] The contact plate portion 88 is the part bent from the lower end of the connecting portion 87. For example, the contact plate portion 88 is bent at a right angle to the connecting portion 87. The contact plate portion 88 extends in the Y direction. The contact plate portion 88 extends in the circumferential direction around the central axis CL (see Figure 28).

[0162] As shown in Figure 30, the contact plate portion 88 has a contact plate body portion 88a and a guide portion 88b.

[0163] The contact plate body portion 88a is flat. The contact plate body portion 88a has a screw hole 88h into which a fixing screw F, described later, is screwed. A connecting portion 87 extends from the contact plate body portion 88a toward the electrode 15a (see Figure 28).

[0164] As shown in Figures 28 and 29, the shaft of the fixing screw F protrudes from the upper surface of the contact plate body 88a. The function of the fixing screw F will be described later.

[0165] The guide portion 88b is inclined with respect to the contact plate body portion 88a. The guide portion 88b has a guide surface 88ba. The function of the guide surface 88ba will be described later.

[0166] As shown in Figure 28, the second connecting member 85 configured as described above is arranged such that one second connecting member 85-1 and the other second connecting member 85-2 are symmetrical with respect to the central axis CL. As can be seen from Figure 32, each contact plate portion 88 is provided in a position facing the terminal contact portion 81a of each first connecting member 81 when the head portion is rotated to a predetermined fixed position.

[0167] In the above, a specific example was given in which the contact plate portion 88 extends in the circumferential direction around the central axis CL, but the present invention is not limited to this. The contact plate portion 88 does not have to extend strictly in the circumferential direction; for example, it may extend in a direction intersecting the axis of rotation.

[0168] (Connection operation by connection structure 80) Figure 33 is a diagram illustrating the connection operation of the connection structure 80. In the state shown in Figure 33(a), the first connecting member 81-1 and the first connecting member 81-2 are arranged in a direction aligned in the X direction. To make the operation of the connection structure 80 easier to understand, the housing 14 of the head unit 10E is not shown, and only the second connecting member 85-1, the second connecting member 85-2, and the fixing screw F are shown.

[0169] Figure 33(a) shows the head portion in a position close to the main body portion 20E in order to connect the head portion to the main body portion 20E. The second connecting member 85-1 and the second connecting member 85-2 are oriented such that their respective contact plate portions 88 extend in the X direction.

[0170] From the state shown in Figure 33(a), the user rotates the head unit around the central axis CL. When the head unit is rotated in this way, the second connecting members 85-1 and 85-2 rotate around the central axis CL. The second connecting member 85-1 will be explained below as an example.

[0171] When the second connecting member 85-1 rotates by a predetermined angle around the central axis CL, the contact plate portion 88 of the second connecting member 85-1 slides under the terminal contact portion 81a of the first connecting member 81-1.

[0172] If the contact plate portion 88 simply extends in the XY plane, it is conceivable that the tip of the contact plate portion 88 will collide with the terminal contact portion 81a, preventing the contact plate portion 88 from properly tucking under the terminal contact portion 81a.

[0173] However, in this embodiment, a guide surface 88ba is formed on the contact plate portion 88. This guide surface 88ba guides a part of the first connecting member (terminal contact portion 81a) to ride up onto the contact plate portion 88 when the head portion rotates around the central axis CL.

[0174] As the second connecting member 85-1 rotates further around the central axis CL and reaches a predetermined fixed position, the lower surface of the terminal contact portion 81a and the upper surface of the contact plate body portion 88a come into contact with each other. In this configuration, the lower surface of the terminal contact portion 81a, which is part of the first connecting member 81-1, and the upper surface of the contact plate body portion 88a, which is part of the second connecting member 85-1, are pressed against each other, and in this state, the first connecting member 81-1 and the second connecting member 85-1 engage with each other.

[0175] In this way, the first connecting member 81-1 and the second connecting member 85-1 physically (mechanically) connect the head portion to the main body portion. Since the first connecting member 81-1 and the second connecting member 85-1 are made of conductive material, when connected, the first connecting member 81-1 and the second connecting member 85-1 are also electrically connected to each other. The same applies to the other first connecting member 81-2 and the second connecting member 85-2.

[0176] To remove the head from the main body 20E, simply rotate the head in the opposite direction to the above. Note that it is not necessary for the head to be rotated by the user, as it only needs to rotate relative to the main body 20E; the user may rotate the main body 20 while the head remains fixed.

[0177] (Relationship between the first connecting member 81 and the second connecting member 85, their configuration, and the sealing member S) Figure 34 schematically shows the state in which the head portion is connected to the main body portion. In the configuration of Figure 34, the sealing member S is positioned between the end face of the head portion 10E and the bottom face of the recess 21a.

[0178] The first connecting member 81 and the second connecting member 85 are provided such that when the terminal contact portion 81a of the first connecting member 81 and the contact plate portion 88 of the second connecting member 85 are engaged (the lower surface of the terminal contact portion 81a is in contact with the upper surface of the contact plate portion 88), the sealing member S is compressed in the Z direction.

[0179] With this configuration, the elastic force generated by the compression of the sealing member S acts as a force that presses the lower surface of the terminal contact portion 81a and the upper surface of the contact plate portion 88 against each other. Therefore, the members can be brought into elastic contact with each other, and a good electrical connection is achieved. In addition, since the sealing member S is in close contact with the end face of the head portion 10E and the bottom surface of the recess 21a, good sealing performance is also obtained.

[0180] (Structural mechanism to prevent rotation) In a method of fixing the head to the main body by rotating the head, as in this embodiment, it is preferable that the head does not move any further once it has been rotated to a predetermined fixed position.

[0181] In the configuration of this embodiment, the fixing screw F functions as a member for preventing rotation. As described above, the shaft of the fixing screw F protrudes from the upper surface of the contact plate portion 88 (see Figure 33(a)).

[0182] When the head is rotated around the central axis CL from the state shown in Figure 33(a) to the state shown in Figure 33(b), the shaft of the fixing screw F comes into contact with a part of the first connecting member 81-1. Specifically, the shaft of the fixing screw F comes into contact with the end face of the terminal contact portion 81a of the first connecting member 81-1. As a result, the head is prevented from rotating any further.

[0183] As described above, in this embodiment, the fixing screw F functions as a rotation stopper. For example, it is also possible to bend a part of the contact plate portion 88 and have the bent portion function as a rotation stopper, but with the configuration in which the fixing screw F is used as a rotation stopper, the range in which the head portion 10 can rotate can be easily adjusted by adjusting the position of the screw hole of the fixing screw F. The above explanation uses the fixing screw F as an example, but a connector such as a fixing pin may be used instead of the fixing screw F.

[0184] (effect) According to the configuration of this embodiment shown in Figure 27, etc., by bringing the head portion 10E close to the main body portion 20E and rotating it around the rotational axis CL, a part of the first connecting member 81 and a part of the second connecting member 85 engage with each other. The head portion 10E can be fixed with such a simple operation. Furthermore, since the first connecting member 81 and the second connecting member 85 are electrically connected to each other, there is no need to provide a separate structure for electrical connection in addition to the structure for fixing the head portion 10E.

[0185] Furthermore, the second connecting member 85 has a configuration that includes a contact plate portion 88 and a connecting portion 87. In the fixed state, the surface of the contact plate portion 88 (here, the upper surface of the contact plate portion 88, see Figure 32, etc.) abuts against a part of the surface of the first connecting member 81 (here, the lower surface of the terminal contact portion 81a). With this configuration in which the first connecting member 81 and the second connecting member 85 are connected in a manner in which surfaces abut, the head portion can be stably fixed to the main body portion. In addition, in this embodiment, the contact plate portion 88 is connected to the electrode 15a, etc. via the connecting portion 87. With this configuration, the connecting portion 87 (or both the connecting portion 87 and the contact plate portion 88) deforms, which has the effect of absorbing assembly errors and preventing the occurrence of contact failures.

[0186] (A resistive element provided as part of the connection structure) Figure 35 is a schematic diagram illustrating an example configuration for the arrangement of resistive elements. As mentioned above, the filling detection sensor of the present invention may include resistive elements. The resistive elements can be placed at any position within the filling detection sensor. However, depending on the position of the resistive elements, it may be necessary to solder them to complex positions on the substrate or wires, which can lead to the problem of time-consuming work.

[0187] The filling detection sensor shown in Figure 35 comprises a connection structure 80 and a resistive element 120. The filling detection sensor's connection structure 80 includes a first connecting member 81-1, a first connecting member 81-2, a second connecting member 85-1, and a second connecting member 85-2. The second connecting member 85-1 and the second connecting member 85-2 are connected to the respective electrodes on the front surface of the head portion.

[0188] In this example, the resistive element 120 is provided in the head portion. The resistive element 120 is arranged to connect, for example, the second connecting member 85-1 and the second connecting member 85-2.

[0189] Although the head unit is not disposed of after each use in concrete placement, its lifecycle is shorter than that of the main unit, and it requires frequent replacement. The resistive element 120 is necessary to check whether the filling detection sensor S100 is electrically normal. With the above configuration in which the resistive element 120 is provided in the head unit, the resistive element 120 is also replaced frequently, resulting in the effect of reducing the likelihood of inspection failures due to deterioration or malfunction of the resistive element 120.

[0190] (Example of fixing a resistive element) The resistive element 120 may be connected to the fixing screw F of the second connecting member 85-1 and the fixing screw F of the second connecting member 85-2. An example of fixing the resistive element 120 will be described below with reference to Figure 36. Figure 36 shows the resistive element fixed to the second connecting member. Figure 36(a) is a perspective view, and Figure 36(b) is a view of the electrodes and resistive element, etc., from above.

[0191] In the example shown in Figure 36, a conductive connecting member 120b is attached to the wire 120a of the resistive element 120. The connecting member 120b is a member with a hole through which a screw is passed. The resistive element 120 is connected to the second connecting member 85 by fastening this connecting member 120b together with a fixing screw F. The resistive element 120 is connected to a fixing screw F provided on one of the second connecting members 85-1 and a fixing screw F provided on the other second connecting member 85-2, and is provided so as to span between the two members.

[0192] When the head unit is attached to the main unit, the terminal contact portion 81a of the first connecting member 81-1 and the terminal contact portion 81a of the first connecting member 81-2 are located between the second connecting member 85-1 and the second connecting member 85-2 (see Figure 36(b)). Therefore, the resistive element 120 is positioned to avoid the region A1 where the terminal contact portion 81a is located. With this configuration, the head unit can be attached without the resistive element 120 interfering with the first connecting members 81-1 and 81-2.

[0193] The configuration in which the fixing screw F functions as a rotation stopper for the head portion 10 and also functions as a component to which the resistive element 120 is connected results in a simplified structure.

[0194] Although the resistive element 120 is shown as being positioned between the second connecting members 85, it may also be positioned between the first connecting members 81. If the resistive element 120 is provided on the main body, it is not necessary to provide the resistive element 120 on the head side, thereby reducing manufacturing costs. In addition, to improve the accuracy of sensor abnormality detection, the resistive element 120 may be provided on both the head and the main body. The resistive element 120 may also be connected by fixing pins instead of fixing screws. Various other methods can be used to connect the resistive element 120, for example, by welding. Furthermore, the connection may be made by attaching (for example, inserting) the wire 120a or connecting member 120b of the resistive element 120 to a predetermined mounting part. In this case, the connecting member 120b is not limited to having a hole through which a screw passes, as shown in the illustrated configuration, but may also be shaped to be inserted into a predetermined mounting part, for example.

[0195] Although the present invention has been described above using embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments, and various modifications and changes are possible within the scope of its gist. For example, all or part of the device can be configured by functionally or physically distributing and integrating in any unit. Furthermore, new embodiments resulting from any combination of multiple embodiments are also included in the embodiments of the present invention. The effects of the new embodiments resulting from the combinations are combined with the effects of the original embodiments. In this application, if there are multiple identical or corresponding structural parts or elements, the technical features of a given structural part or element are applicable to other structural parts or elements. [Explanation of symbols]

[0196] 10 Head section 10A Head Unit 10B Head Unit 10C Head 11 Tip surface 12 Outer surface 13 Back 14 cabinets 14a Proximal part 14b Tip side part 14s outer surface 14s' outer circumferential surface 14t pressure surface 15 Sensor section 15a 1st electrode 15b 2nd electrode 16 Head lead wires 16a First head lead wire 16b Second head lead wire 17 screw holes 18 Groove 20 Main body 20A Main Unit 20B Main body 21 Front 21a Recess 21b side 21c Inner surface 21d Protrusion 23 Through-holes 25 screws 26 Protrusion 28 circuit boards 29a 1st terminal 29b 2nd terminal 30 Main unit lead wires 30a First main lead wire 30b Second main lead wire 31 External lead wires 50 Connection Structures 51 Connection terminals 51h through hole 55 Electrical connection 60 formwork 61 Through hole 70 Retaining mechanism 71 Terminal guide plate 75 Connecting Member 75a Protrusion 81 First connecting member 81a Terminal contact part 81b Extension 85 Second connecting member 86 Base 87 Connection part 88 Contact plate section 88a Contact plate body 88b Guide section 88ba guide surface 88h screw holes 91 Indicators 92a First Indicator 92b Second Indicator 93 Indicators 120 Resistor elements B bolt F Fixing screw m1 magnet m2 magnet M1 Magnet M2 magnet S sealing member S100 Filling Detection Sensor S101 Filling detection sensor S102 Filling detection sensor Sw fixing screw

Claims

1. The head portion is inserted into the through-hole of the formwork, The head portion is detachably attached to the main body portion, Equipped with, The head portion is provided with a sensor portion for detecting the filling of the object to be detected. The main body is provided with an electrical circuit that is electrically connected to the sensor unit. The head portion is attached to the main body portion and protrudes from the main body portion, and the length of the head portion in a reference direction perpendicular to the direction in which the head portion protrudes is shorter than the length of the main body portion in the reference direction. Filling detection sensor.

2. Of the head portion, a connecting portion is provided on the side opposite to the side facing the object to be detected, where the sensor portion is located, to which a pulling member for pulling the head portion out of the through hole is connected. The filling detection sensor according to claim 1.

3. The head portion and the main body portion are connected by a screw connection. The connecting portion is a screw hole into which a screw is screwed, which is provided to protrude from the main body, or a member provided to protrude from the head portion. The filling detection sensor according to claim 2.

4. The main body is provided with through holes into which fasteners are inserted to fix the main body to the formwork. A filling detection sensor according to claim 1 or 2.

5. The head portion and the main body portion are connected by a magnet. The filling detection sensor according to claim 1.

6. With the head portion attached to the main body portion, the sensor portion and the electrical circuit are electrically connected via the magnet. The filling detection sensor according to claim 5.

7. The sensor unit includes a pair of electrodes arranged at intervals from each other. The pair of electrodes are provided on the tip surface of the head portion. A filling detection sensor according to claim 1 or 2.

8. The pair of electrodes are provided on the same plane as the tip surface, or in a position recessed from the tip surface. The filling detection sensor according to claim 7.

9. The contour shape of the main body portion has a reference side that extends in a predetermined direction, When the head portion is attached to a predetermined fixed position on the main body portion, the direction in which the pair of electrodes are aligned is parallel to or perpendicular to the reference side. The filling detection sensor according to claim 7.

10. The main body has a recess into which a part of the head is inserted. A filling detection sensor according to claim 1 or 2.

11. The main body has a recess into which a part of the head is inserted. A groove is formed in the portion of the head that is inserted into the recess. The main body is provided with a projection that fits into the groove when the head is attached to the main body. The filling detection sensor according to claim 1.

12. A sealing member is positioned between the head portion and the main body portion to prevent water from entering the electrical connection portion that electrically connects the sensor portion and the electrical circuit. A filling detection sensor according to claim 1 or 2.

13. The sealing member is a ring-shaped elastic member and is provided at least one of the following positions: between the side of the head portion opposite to the side on which the sensor portion is provided and the side of the main body portion facing that side, and between the outer circumferential surface of the portion of the head portion that is inserted into the recess formed in the main body portion and the inner circumferential surface of the recess. The filling detection sensor according to claim 12.

14. It is equipped with a connecting structure that connects the head portion and the main body portion, The aforementioned connection structure is A connection terminal is provided so as to protrude from one of the head portion and the main body portion, A terminal receptacle is provided on the other side of the head portion and the main body portion, into which the connection terminal is inserted in a predetermined insertion direction, Having, The filling detection sensor according to claim 1.

15. The aforementioned connection structure is The device further includes a retaining mechanism to prevent the connection terminal from coming out of the terminal receiver, from a first state in which the connection terminal is inserted into the terminal receiver, to a second state in which the head portion is rotated around a rotation axis parallel to the insertion direction. The filling detection sensor according to claim 14.

16. The contour shape of the main body portion has a reference side that extends in a predetermined direction, The head portion has a pair of electrodes arranged at intervals from each other, and the direction in which the pair of electrodes are aligned intersects the reference side in the first state and is parallel to or perpendicular to the reference side in the second state. The filling detection sensor according to claim 15.

17. The main body or the head portion, At least one of the following is provided: an indicator indicating the direction of rotation of the head portion relative to the main body portion, or an indicator indicating the orientation of the main body portion. The filling detection sensor according to claim 15.

18. The main body has a recess into which the head is inserted. The head portion is, The base end portion inserted into the recess, A tip portion formed to protrude from the base end portion, It has, The head portion is provided in such a shape that, when viewed from the tip side, the contour of the tip portion is located inward compared to the contour of the base portion. The filling detection sensor according to claim 1.

19. A sealing member is provided between the head portion and the main body portion. The sealing member is provided at least one of the following positions: between the outer circumferential surface of the base end portion and the inner circumferential surface of the recess, and between the surface of the head portion opposite to the side on which the sensor portion is provided and the surface of the main body portion facing that surface. The filling detection sensor according to claim 18.

20. It includes a connecting structure that connects the head portion and the main body portion, The aforementioned connection structure is A conductive first connecting member provided on the main body, A conductive second connecting member provided on the head portion, It has, By bringing the head portion close to the main body portion and rotating it around a predetermined rotational axis to a fixed position, a part of the first connecting member and a part of the second connecting member engage with each other, and the first connecting member and the second connecting member are electrically connected. The filling detection sensor according to claim 1.

21. The second connecting member is, A contact plate portion extending in a direction intersecting the rotational axis, A connecting portion extending from the contact plate portion toward the electrode provided at the tip of the head portion, It has, When the head portion rotates to the fixed position, the surface of the contact plate portion comes into contact with a part of the surface of the first connecting member. The filling detection sensor according to claim 20.

22. The aforementioned contact plate portion is The head portion has an inclined guide surface that guides a portion of the first connecting member to ride up onto the contact plate portion when the head portion is rotating around the rotation center axis, The filling detection sensor according to claim 21.

23. A fixing screw or fixing pin is inserted into the contact plate portion. The fixing screw or fixing pin, when the head portion rotates to the fixed position, contacts the first connecting member to prevent the head portion from rotating any further. The filling detection sensor according to claim 21 or 22.

24. As the second connecting member, one of the second connecting members and the other of the second connecting members are provided on the head portion. A resistive element is provided so as to be stretched between the fixing screw or fixing pin provided on one of the second connecting members and the fixing screw or fixing pin provided on the other second connecting member. The filling detection sensor according to claim 23.

25. A step of attaching the filling detection sensor according to claim 1 or 2 to the mold, A step of detecting that the object to be detected has been filled based on the detection result of the filling detection sensor, A filling detection method, including the following.

26. The sensor portion includes a pair of electrodes arranged at intervals from each other, and the pair of electrodes are provided on the tip surface of the head portion. The process further includes the step of attaching the filling detection sensor to the mold in a manner such that the first electrode and the second electrode of the pair of electrodes are aligned in a direction that intersects vertically. The filling detection method according to claim 25.

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